巻号一覧
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18 巻, 7 号
選択された号の論文の9件中1～9を表示しています
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1964 年 18 巻 7 号 p. 39-40
発行日: 1964/07/05
公開日: 2009/11/10
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石川 久雄1964 年 18 巻 7 号 p. 261-268
発行日: 1964/07/05
公開日: 2009/11/10
ジャーナル フリーThe biosynthetic pathway of lignin in plants have been actively investigated recently by tracer experiments using C14-labelled compounds. There can be no doubt that lignin is a product of shikimic acid pathway, “Davis' scheme of aromatic amino acid biosyntheses”. The probable intervation of prephenic acid in lignin biosyntheses discuses from the interesting results on the formation of phenylpropane derivatives, such as phenylalanine, tyrosine, p-coumaric acid, ferulic acid, synapic acid, caffeic acid and other compounds from shikimic acid in the plant tissues.
The intermediates, such as ferulic acid derivatives, which may be formed from phenylpyruvic acid in the tissues, may be reduced to primary building stones of the type of coniferyl alcohol.
In the systematic experiments on the lignin biosyntheses in which p-coumaric alcohols and acids are administered, either by implantation or by imbibition, these compounds were effectively converted to lignin. In this reaction, hydrogen is abstracted from the phenolic hydroxyl group by the action of a dehydrogenation enzyme, such as lactase or peroxidase, with the formation of a radical which can react in various mesomeric forms. Accoding to Freudenberg, the formation of lignin from primary building stones take place via secondary building stones of dimeric phenylpropane derivatives, and then lignin must be considered to be a product formed by the polymerization of dehydrogenated coniferyl alcohol radicals and the dehydrogenation products of the secondary alcohol stones, via radicals, each of which can exist in various mesomeric forms, in possible ways.
A aspect on the biosyntheses of lignin in plants have now reached the stage where hypothesis about biochemical pathway obtained by the tracer investigations have to be confirmed by series of biochemical reactions based on the enzyme system of lignin formation. Few investigators found some enzyme, such as tyrase and phenylalanane, in plants. One of many questions on the chemical structures of lignin and dehydrogenation polymers formed from coniferyl alcohol derivatives is a problem on the stereo-chemical structures of these compounds.抄録全体を表示PDF形式でダウンロード (1429K) -
クラフトパルプ黒液からジメチルサルファイドの製造赤松 勲, 藤井 利郎, 木村 裕1964 年 18 巻 7 号 p. 269-272
発行日: 1964/07/05
公開日: 2009/11/10
ジャーナル フリーWhen mixture of concentrated kraft pulp black liquor (solid content about 50%) and sodium sulfide was heated for 3 hours at 300°C, crude dimethyl sulfide which is comparable to 3.45% of solid component was prepared.
According to gas chromatographic analisis, the crude dimethyl sulfide contained, as impurities, methyl mercaptan, ethyl mercaptan and unknown substance. The crude dimethyl sulfide could not purify by only fractional distillation.
The results are described in the Table 2 and Fig. 6.抄録全体を表示PDF形式でダウンロード (626K) -
(第5報) ポリエチレンオキシドの抄紙性錦織 禎徳, 町田 誠之1964 年 18 巻 7 号 p. 273-277
発行日: 1964/07/05
公開日: 2009/11/10
ジャーナル フリーIn paper making with natural and synthetic fibers by traditional Japanese hand process, fiberdispersion capability of aqueous solution of polyethylene oxide of various degrees of polymerization was studied.
The paper making properties of the fibers in the polyethylene oxide solution were compared with these in the solution of Tororo-aoi mucilage.
Results obtained are summarized as follows.
1) The dispersion capability of polyethylene oxide to rayon, Vinylon and Kanekaron fibers is rather better than that of Tororo-aoi mucilage, but the capability to Kôzo pulp and sulphite pulp is somewhat worse than the mucilage.
2) The dispersion capabity of the polyethylene oxide depends upon its degree of polymerization; polyethylene oxide of molecular weight of 3, 000, 0004, 000, 000 shows the best capability in the paper making.
3) Filterability of each solution of minimum concentration to be able to make a paper has close relation to the dispersion capability; the solutions of high filterability show good paper making properties.
4) Sedimentation velocity of the fibers in the solution has no direct relation to the paper making properties of the solution.抄録全体を表示PDF形式でダウンロード (1051K) -
第20報 朝鮮産手すき紙の性状加藤 晴治1964 年 18 巻 7 号 p. 279-280
発行日: 1964/07/05
公開日: 2009/11/10
ジャーナル フリーChemical and physical characteristics of about eight kinds of Korean hand-made paper have been examined.
To some extent there exist mulberry fibers in the Korean hand-made paper, the quality of the paper is not so high, except two or three kinds of it which were made from pure mulberry.
These papers are mostly used for the purpose of lining the surface of the floor mainly consisting of hardened mud soil and mildly warmed up from under by means of a heating system known as “Ondoru”, the room temperature at the same time beeing made comfortable enough to live in during the severe wintertime in this country.
The strength is not so important property for paper purely made from mulberry, so that regenerated materials were (often) used for making this paper which in turn became coarse and rough in its quality.
Keizankoshaku and Nanyo-fu papers have the same quality as the above and they are thin paper with the material mulberry fibers. Their strength is comparatively great, but other papers produced in Korea are mostly coarse and thick but not strong.抄録全体を表示PDF形式でダウンロード (410K) -
奥田 昌信1964 年 18 巻 7 号 p. 281-287
発行日: 1964/07/05
公開日: 2009/11/10
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編集部1964 年 18 巻 7 号 p. 288-289
発行日: 1964/07/05
公開日: 2009/11/10
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特に原価と品質の関係に関する研究 (その3)加納 正直1964 年 18 巻 7 号 p. 290-293
発行日: 1964/07/05
公開日: 2009/11/10
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1964 年 18 巻 7 号 p. 294-296
発行日: 1964/07/05
公開日: 2009/11/10
ジャーナル フリーPDF形式でダウンロード (739K)
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